classer = ('AA','BB','CC');
print(classer);

t = ('a','b',['c','d']);
print(t);
t[2][1] = 'D';
print(t);

# -*- coding: utf-8 -*-

L = [
    ['Apple', 'Google', 'Microsoft'],
    ['Java', 'Python', 'Ruby', 'PHP'],
    ['Adam', 'Bart', 'Lisa']
]

print(L[0][0]);
print(L[1][1]);
print(L[2][2])
